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Xi-Wei Liu

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#artificial intelligence Preprint Sep 2026

DoAtlas-2: A Foundation for Self-Evolving Causal Biomedical Discovery

We introduce DoAtlas-2, a foundation for self-evolving causal biomedical discovery that organizes knowledge around causal mechanisms and advances through external evidence from human populations. DoAtlas-2 integrates 771 research resources covering more than 720,000 participants in 48 countries, from longitudinal clini...

Yu-Long Li, Rong Xia, Yuxuan Zhang et al. · 0 citations

#small language model Preprint Aug 2026

Grounding Isn't Knowing: Do VLMs Need Object Localization for Spatial Reasoning?

This work investigates two representative model families, LLaVA-1.5 and Qwen2.5, and provides a token-, layer-, and head-level account of how VLMs transform object grounding into spatial relations, showing that knowing where objects are is not equivalent to knowing how they relate.

Xi-Wei Liu, Yu-Long Li, Xinlin Zhuang et al. · 1 citation